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For an intrinsic semiconductor at temperature 
, which of the following statement is true?
All energy states in the valence band are filled with electrons and all energy states in the conduction band are empty of electrons.
All energy states in the valence band are empty of electrons and all energy states in the conduction band are filled with electrons.
All energy states in the valence and conduction band are filled with holes.
All energy states in the valence and conduction band are filled with electrons.
Intrinsic semiconductor at 
behaves as an insulator.
Hence, valence band is completely filled with electrons and conduction band is completely empty.